Coffee Science
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3355
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Resultados da Pesquisa
Item Biochemical parameters of an Oxisol submitted to high doses of gypsum in the coffee culture(Editora UFLA, 2020) Naves, Andrêssa de Paula; Silva, Aline Oliveira; Barbosa, Marisângela Viana; Pinto, Flávio Araújo; Santos, Jessé Valentim dos; Saggin Junior, Orivaldo José; Guimarães, Paulo Tácito Gontijo; Carneiro, Marco Aurélio CarboneThe objective of this study was to determine the influence of increasing doses of agricultural gypsum on the quality of the soil biochemical parameters in coffee cultivation (Coffea arabica L.) over two climatic seasons in the Brazilian Cerrado. Soil samples were collected in two seasons (dry and rainy season), at 0.00 – 0.10 m depth of an Oxisol, submitted to doses 0 (GSA); 3.5 (G3.5); 7.0 (G7.0) and 14 (G14) t ha-1 of agricultural gypsum in the coffee planting line. The biochemical parameters evaluated were: total organic carbon (TOC); microbial biomass carbon (MBC); soil basal respiration (SBR); absolute enzymatic activities [Urease, acid phosphatase, hydrolysis of fluorescein diacetate (FDA)], and enzymatic activity per unit of MBC. The significant effect (p ≤ 0.05) of gypsum doses was observed for MBC and SBR, which were higher in the treatment with G7.0 application. TOC, the enzymatic activities of Phosphatase and the FDA showed no differences between treatments. On the other hand, the specific enzymatic activities by MBC were used to describe the differences between the doses of gypsum applied, generally with greater activity in treatments G7.0 and G14. The accumulated coffee productivity was higher in G14 treatment. The results presented confirmed that the biochemical parameters of the soil are key in the evaluation of changes in soil use, and that the increase in gypsum favors activity and microbial biomass.Item Magnesium in the dynamics of carbohydrates and antioxidant metabolism of coffee seedlings in two irradiance levels(Editora UFLA, 2018-07) Dias, Kaio Gonçalves de Lima; Guimarães, Paulo Tácito Gontijo; Furtini Neto, Antônio Eduardo; Faquin, Valdemar; Pádua, Eduane José de; Silveira, Helbert Rezende Oliveira deThe aim of this study was to verify the physiological impacts and the carbohydrate dynamics of Coffea arabica, seedlings subjected to increasing concentrations of magnesium (Mg) and two irradiance levels. Methods: The experiment was carried out in growth chambers with nutrient solution. The treatments were five concentrations of Mg (0, 48, 96, 192, and 384 mg L-1 ) and two irradiance levels (80 and 320 μmol of photons m-2 s-1 ). The coffee seedlings were under the treatments for 90 days. Results: The leaves with deficiency or excess of Mg exposed to the irradiance of 320 μmol of photons m -2 s-1 accumulated more carbohydrates than those exposed to 80 μmol of photons m 2 s-1 . The accumulation of carbohydrates in the leaves increased the activity of antioxidant enzymes due to the increased production of reactive oxygen species (ROS). Leaves exposed to 320 μmol of photons m-2 s-1 exhibited symptoms of scald by the sun caused by photo-oxidation. The scald was more intense in plants with abnormal concentrations of Mg. The antioxidant system of the coffee tree is closely relates to the Mg supply and irradiance levels. Concentrations of Mg between 48 and 96 mg L-1 functioned as a mitigating agent of oxidative stress under stressful conditions caused by high irradiance level.Item Arbuscular mycorrhiza in Coffea arabica L.: review and meta-analyses(Editora UFLA, 2017-07) Cogo, Franciane Diniz; Guimarães, Paulo Tácito Gontijo; Rojas, Enrique Pouyú; Saggin Júnior, Orivaldo José; Siqueira, Jose Oswaldo; Carneiro, Marco Aurelio CarboneCoffee, a plant of global economic importance, presents a high degree of micotrophy for nutrients absorption, especially phosphorus, whose sources are scarce, and extremely required in tropical soils. Arbuscular mycorrhizal fungi (AMF) and coffee crop (Coffea arabica) have been studied for more than three decades, and therefore, analyzing and gathering these studies in a quantitative and qualitative way by means of meta-analysis and critical review of advances and trends is of great relevance. In this review, aspects such as geographic distribution, ecology, effects on plant growth, mineral nutrition, myotrophism, and symbiotic efficiency and its applications were discussed, with special emphasis on the researches carried out in Brazil. By applying the electronic databases Cab Abstracts, Springerlink, Science Direct, Scielo, Scopus, ISI, Lilascs, Woldcat, 73 studies were analyzed, including papers, dissertations and theses. The meta-analysis showed the importance of AMF for growth, plant nutrition and grain yield. Nevertheless, a gap is still evident in the evaluation of the different management strategies adopted in coffee crop and their effects on AMF. The need to extend the research under field conditions was also detected, in order to confer the real contribution of AMF in coffee biocontrol, and their action as biofertilizers and biostimulants.Item Cobre via foliar na nutrição e na produção de mudas de cafeeiro(Editora UFLA, 2015-10) Dias, Kaio Gonçalves de Lima; Carmo, Davi Lopes do; Pozza, Adélia Aziz Alexandre; Pozza, Edson Ampélio; Guimarães, Paulo Tácito GontijoObjetivou-se, com este estudo, avaliar o efeito de fontes e doses de cobre (Cu) aplicado via foliar na nutrição e na produção de mudas de cafeeiro. Os tratamentos consistiram de combinações de duas fontes (Sulfato Cúprico Amoniacal - SCA e Sulfato de Cobre - SC) e quatro doses (0, 250, 500 e 1000 g ha -1 ) de Cu. As fontes de Cu nas diferentes doses foram dissolvidas em água e calculadas para o volume de pulverização foliar de 400 L ha -1 de calda. As doses foram parceladas em três aplicações espaçadas de 20 dias. Avaliaram-se os teores e o conteúdo de Cu na folha, no caule, na raiz e total das plantas; a matéria seca da folha, caule, raiz e total; a eficiência de utilização, a eficiência de absorção e a eficiência de translocação em mudas de cafeeiro. De modo geral,os maiores teores e conteúdos de Cu foram obtidos para a fonte SC. Os incrementos máximos de matéria seca total foram de 48 g para o SCA e de 51 g para o SC, para as doses de 534 e 668 g ha -1 , respectivamente. As maiores eficiências de utilização e de absorção foram constatadas para o SCA e SC, respectivamente. A eficiência de translocação foi semelhante para as duas fontes.Item Seasonal change of soil precompression stress in coffee plantation under sub-humid tropical condition(Editora UFLA, 2014-04) Iori, Piero; Dias Junior, Moacir de Souza; Ajayi, Ayodele Ebenezer; Guimarães, Paulo Tácito Gontijo; Souza, Zélio Resende de; Figueiredo, Vanessa CastroThe objective of this study was to describe the seasonal change of precompression stress behavior in coffee plantations in the sub-humid tropic zone of Brazil as affected by agriculture traffic associated with the time since the establishment the coffee plantation, field slope, sampling position in and sampling depths. The coffee plantations on a uniform soil type; Red-Yellow Latosol were aged 2, 7, 18 and 33 years. Areas with side slope of 3, 9 and 15% were selected in these coffee plantations for this study. The soil was sampled at three positions on the coffee plantation row (bottom of traffic line, inter-row and top of traffic line) and at two depths (topsoil and sub-surface). Samples were collected over a one year period for each month of year. The study showed that the time since the establishment of a coffee farm and the slope steepness had significant effect on soil disturbance in mechanized operation. The coffee plantation with longer establishment time and on steeper terrain had higher precompression stress. The top traffic line presented higher load-bearing capacity than inter-row and bottom traffic line. The sites were more susceptible to compaction in the period from November to January of the year , because the Red-Yellow Latosol presented lower load-bearing capacity than the stress applied by tractor used in coffee management practices.Item Produtividade do cafeeiro arábica em condições de adensamento, no noroeste Fluminense(Editora UFLA, 2014-01) Andrade, Wander Eustáquio de Bastos; Guimarães, Paulo Tácito Gontijo; Faquin, Valdemar; Guimarães, Rubens JoséObjetivou-se, neste trabalho, avaliar diferentes arranjos populacionais, (espaçamentos entre linhas x espaçamentos entre plantas na linha), na produtividade do cafeeiro arábica, na região Noroeste Fluminense. Utilizou-se a cultivar Catuai Vermelho IAC 144, no delineamento de blocos ao acaso, com quatro repetições, em esquema de parcela subdividida. Nas parcelas, foram utilizados quatro espaçamentos entre linhas de plantio (1,0; 1,5; 2,0 e 2,5 m) e, na subparcela, quatro espaçamentos entre plantas na linha (0,25; 0,50; 0,75 e 1,00 m). O experimento foi avaliado no período de 2004 a 2011 (oito produções) pela análise da produção acumulada, em sacas de 60 kg de café beneficiadas por hectare e pelas médias dos biênios de produção. O plantio das mudas foi em fevereiro de 2002, em Latossolo Vermelho-Amarelo. Os dados foram submetidos à análise de variância individual, e as diferenças entre as médias foram comparadas pelo teste de F, a 5% de probabilidade, para estudo por meio de regressão. Concluiu-se que a redução no espaçamento entre as linhas, e entre as plantas na linha, propicia aumento de produção nas primeiras colheitas; sabe-se que combinações mais produtivas para uma mesma população de plantas por hectare ocorrem quando se emprega menor espaçamento entre plantas na linha e que a mesma população de plantas, mas em diferentes arranjos, não proporciona a mesma produção.Item Índice de saturação por bases na nutrição e na produtividade de cafeeiros 'Catuaí Vermelho' (Coffea arabica L.)(Editora UFLA, 2007-07) Corrêa, João Batista; Reis, Thiago Henrique Pereira; Pozza, Adélia Aziz Alexandre; Guimarães, Paulo Tácito Gontijo; Carvalho, Janice Guedes deA calagem confere vários benefícios à cultura do cafeeiro (Coffea arabica L.), dentre os quais destaca-se o fornecimento de cálcio e magnésio e, consequentemente, a elevação da saturação por bases (V%) do solo. Este trabalho foi desenvolvido com o objetivo de obter o índice de saturação por bases ideal para essa cultura, correlacionando-o com a nutrição e produção das plantas. O ensaio foi conduzido sob Latossolo Vermelho-Amarelo argiloso, fase cerrado , no município de Lavras (MG), entre os anos de 2000 e 2002, com a cultivar Catuaí vermelho IAC-144, de 6 anos de idade, plantadas no espaçamento de 2,5 x 0,80 m. Utilizou-se o delineamento experimental em blocos casualizados, com quatro repetições, estimando-se as saturações por bases: 30, 40, 50, 60 e 70%. A maior produção do cafeeiro foi obtida na saturação por bases (V%) de 55,1%, com média de 33 sacas de café beneficiado ha-1 . Valor de V acima de 48% promoveu aumento nos teores foliares de Ca, N, Fe e B. O aumento do valor da saturação por bases (V%) elevou os teores de cálcio, a relação Ca:Mg e o pH do solo e reduziu os teores de Al, a saturação por Al (m%), a acidez potencial (H + Al) e os teores foliares de manganês.Item Weed management and its influence on the load bearing capacity of red-yellow latosol under the crown projection in coffee culture(Editora UFLA, 2009-07) Santos, Gislene Aparecida dos; Dias Junior, Moacir de Souza; Guimarães, Paulo Tácito Gontijo; Araújo Junior, Francisco; Pais, Paula Sant Anna MoreiraWeed management is identified as a major cause of soil compaction in coffee plantations, because of its necessary frequent undertaking. The objectives of this study were: a) to develop bearing capacity models, for a Red-Yellow Latosol cultivated with coffee (Coffea arabica, L.), as a function of the associated weed management methods, preconsolidation pressure and moisture; b) to identify, through the use of these models, the weed management more resistant and more susceptible to soil compaction, under the coffee crown projection. This study was carried out in an experiment installed in the Experimental Farm of EPAMIG in Patrocínio MG, using the Rubi cultivar 1192. The weed control methods were: Hand hoe, Post-emergence herbicide, Pre-emergence herbicide and Brush Trimmer (Roçacarpa commercial name), associated with the rotary tiller, disk harrow, were mower and no weed control between plant rows. For each weed management, 15 samples were collected at depths of 0-3, 10-13 and 25-28 cm, to generate the capacity bearing model, totaling 720 undisturbed soil samples. To obtain the capacity bearing models, the undisturbed soil samples with different moisture content were submitted to the uniaxial compression tests according to Bowles (1986) modified by Dias Junior (1994). The pre-emergence herbicide associated to no weed control condition and were mower and the hand hoe associated to no weed control presented higher resistance to soil compaction. The Brush Trimmer (Roçacarpa) methods, associated to were mower; the Pre-emergence herbicide, associated to rotary tillers; and Pre-emergence herbicide and Brush Trimmer, associated to disk harrow between rows, presented higher susceptibility to soil compaction.Item Coffee tree (Coffea arabica L.) response to limestone en soil with high aliminum saturation(Editora UFLA, 2007-07) Mendonça, Sebastião Marcos de; Martinez, Herminia Emilia Prieto; Neves, Julio César de Lima; Guimarães, Paulo Tácito Gontijo; Pedrosa, Adriene WoodsAlthough Coffea arabica L. is not particularly sensitive to Al toxicity, the species presents different tolerance among varieties. The varieties previously classified as sensitive, Catimor (232T15-PN- UFV 3880), moderately tolerant, Catuaí 99 (IAC 99) and Catuaí Vermelho (IAC 15), and tolerant, Icatu (IAC 4045), were evaluated under field conditions. They were subjected to four limestone levels: 0.0; 0.5; 1.0; and 1.5 times the limestone requirement (LR) calculated by the base saturation method, considering 70% as the saturation reference value. The shoot and root growth were evaluated after 23 and 34 months, respectively, and the concentrations of Ca, Mn, Zn and Cu in the leaf tissues after 34 months. The shoot development of the variety UFV 3880 was not affected by liming levels. For roots development, limestone doses from ranging 0.74 to 0.84 LR, provided the largest concentrations of Ca in the foliar tissues. IAC 99 presented the best shoot development with limestone doses from 0.25 to 0.54 LR, and the best root development with doses from 0.33 to 0.40 LR. IAC 15 had a linear increase of root length and root specific surface with the increase of the limestone doses, which caused root thinning and elongation. This suggests that this variety is more sensitive to soil Al saturation than the other tested varieties. The IAC 4045 presented the best shoot and root development with liming ranging from 1.06 to 1.14 LR. It seems that other soil constraints, such as Mn content, impaired this variety development in lower limestone doses. Aluminum soil saturation up to 30 % in the superficial soil layer did not interfere in the development of the roots and shoots of the tested varieties.Item Efeito da associação silício líquido solúvel com fungicida no controle fitossanitário do cafeeiro(Editora UFLA, 2008-01) Reis, Thiago Henrique Pereira; Figueiredo, Felipe Campos; Guimarães, Paulo Tácito Gontijo; Botrel, Priscila Pereira; Rodrigues, Carlos RibeiroRealizou-se este trabalho com o objetivo de verificar os efeitos da associação do silício foliar com fungicida no controle fitossanitário do cafeeiro (Coffea arabica L.). O experimento foi instalado em Três Pontas-MG, numa lavoura cultivar Mundo Novo. O delineamento utilizado foi em blocos casualizados, sendo os tratamentos: silício solúvel 4 L/ha; silício solúvel 3 L/ha + fungicida 0,375 L/ha; silício solúvel 2 L/ha + fungicida 0,75 L/ha; silício solúvel 1 L/ha + fungicida 1,125 L/ha; fungicida 1,5 L/ha, e testemunha sem pulverização. Concluiu-se que metade da dose recomendada de silício solúvel associada à metade da dose recomendada do fungicida controlou a ferrugem e a cercóspora, semelhantemente à dose recomendada do fungicida.